Submit button should be disabled until input

[stephendonner]

Description

Submit button should be disabled until input

Steps to Reproduce

1. install 1.44.92
2. launch Brave
3. open brave://settings/privacy
4. toggle Use Bridges to Enabled
5. click on the Request a bridge from torproject.org radio button
6. click on the Request a New Bridge...` button
7. notice and click on Submit

Actual result:

Submit is enabled

Expected result:

The Submit button should be disabled, until input

Reproduces how often:

100%

Brave version (brave://version info)

Brave	1.45.59 Chromium: 106.0.5249.40 (Official Build) nightly (64-bit)
Revision	fab1d91915d2722d6339aaa7f4e9ce44f1e9b103-refs/branch-heads/5249@{#442}
OS	Windows 10 Version 21H2 (Build 19044.2006)

Version/Channel Information:

• Can you reproduce this issue with the current release?
• Can you reproduce this issue with the beta channel?
• Can you reproduce this issue with the nightly channel?

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

Miscellaneous Information:

cc @MadhaviSeelam @boocmp @aguscruiz